I not like V2, it need a lot of software support for get better result. Also not like use librares for hardware access (it slowdown it, but yes allow more easy change CPU if it need).
Also about F version, it good platform (from hardware side) but also not get software support.
Anyway H and H4 also have software support only from me and OneOfEleven.
NanoVNA H or H4 i think can be better if not use DC-DC converters (use linear for all analog circuits, and separate power to every device), i see 32kHz noise on ADC (touch and vbat measure).
At this moment i fully cleanup and reviewed all H and H4 code, and it stable and very compact.
SI4432 at this moment not show good result (phase noise too bug) in all cases up to 1500MHz, SI5351 mode better (i get good resuls on 192kHz mode, and made some other fixes for sweep on this device, and port it to H and H4 version). It need more hardware improvement.
